It works for probably 95% of all my TV Shows. The type of show it's not going to be ideal for is the type that starts out playing the show for 1.5 to 3 minutes, then does the intro.
In a nutshell, Emby analyzes each episode of a show. It then compares the show episodes together looking for a common Introduction sequence. If it finds this sequence it can jump to the end of it for you, aka Intro Skip.